摘要
The microstructure and hydrogen storage properties of low V content(Ti0.46Cr0.54) 100-x V x(x = 2.5–7.1, at%) and(TiyCr1-y)95V5(y = 0.38–0.54) alloys were investigated. These alloys were prepared by arc melting and copper mould suction casting. The structures of as-cast(Ti0.46Cr0.54) 100-x V x(x = 2.5, 5.0, and 7.1) alloy ingots evolve with V contents from pure Laves-(x = 2.5) to dual-phase TiCr2-BCC structures(5.0 and 7.1), whereas the suction-cast(Ti0.46Cr0.54) 100-x V x(x = 2.5, 5.0, and 7.1) alloys only contain single BCC phase. The suctioncast alloy rod(Ti0.46Cr0.54)95V5, containing only 5.0 at% V is shown to possess the optimum hydrogen absorption capacity, with the maximum hydrogen content of 3.14 wt%. Furthermore, the hydrogen storage properties of the suction-cast low V alloys(TiyCr1-y)95V5(y = 0.38–0.54) are sensitive to Ti/Cr ratios and only those alloys with Ti/Cr ratios close to the CN14 cluster [Ti7Cr8 ] have good hydrogen storage properties.
The microstructure and hydrogen storage properties of low V content （Ti0.46Cr0.54）100-xVx （x = 2.5-7.1, at%） and （TiyCr1-y）95V5 （y= 0.38-0.54） alloys were investigated. These alloys were prepared by arc melting and copper mould suction casting. The structures of as-cast （Ti0.46Cr0.54）100-xVx （x = 2.5, 5.0, and 7.1） alloy ingots evolve with V contents from pure Laves-（x = 2.5） to dual-phase TiCr2-BCC structures （5.0 and 7.1）, whereas the suction-cast （Ti0.46Cr0.54）100-xVx （x =2.5, 5.0, and 7.1） alloys only contain single BCC phase. The suction-cast alloy rod （Ti0.46Cr0.54）95V5, containing only 5.0 at% V is shown to possess the optimum hydrogen absorption capacity, with the maximum hydrogen content of 3.14 wt%. Furthermore, the hydrogen storage properties of the suction-cast low V alloys （TiyCr1-y）95V5 （y = 0.38-0.54） are sensitive to Ti/Cr ratios and only those alloys with Ti/Cr ratios close to the CN14 cluster [TiTCrs] have good hydrogen storage properties.
基金
financially supported by the National Natural Science Foundation of China(Nos.51171035 and 11174044)
